为了研究不同粒径废阴极射线管玻璃(Cathode Ray Tube,简称:CRT)玻璃纱对混凝土性能的影响,采用四种最大粒径CRT废玻璃砂取代25%的河砂,同时掺入20%粉煤灰作为矿物掺合料配制成防辐射混凝土,并开展了混凝土相关性能的研究。结果表明:CR...为了研究不同粒径废阴极射线管玻璃(Cathode Ray Tube,简称:CRT)玻璃纱对混凝土性能的影响,采用四种最大粒径CRT废玻璃砂取代25%的河砂,同时掺入20%粉煤灰作为矿物掺合料配制成防辐射混凝土,并开展了混凝土相关性能的研究。结果表明:CRT废玻璃砂增大了混凝土的坍落度、表观密度,使得碱骨料反应膨胀率增大,混凝土抗压强度减小,混凝土屏蔽性能增强。随着最大粒径的减小,混凝土的坍落度、表观密度减小,立方体抗压强度先增大后减小,当最大粒径为2. 36 mm时,立方体抗压强度达到最大值,碱骨料反应膨胀率减小,混凝土的防辐射效果有所增强。展开更多
废弃阴极射线管(cathode ray tubes,CRT)玻璃因其含有有害物质铅而导致严重环境问题,为此,使用粉煤灰、磨细矿渣作为矿物掺合料,研究了磨细阴极射线管玻璃(ground cathode ray tube glass,MG)取代0、30%、60%、100%(质量分数,下同)河砂...废弃阴极射线管(cathode ray tubes,CRT)玻璃因其含有有害物质铅而导致严重环境问题,为此,使用粉煤灰、磨细矿渣作为矿物掺合料,研究了磨细阴极射线管玻璃(ground cathode ray tube glass,MG)取代0、30%、60%、100%(质量分数,下同)河砂细骨料时砂浆新拌性能、力学性能、干缩性能、碱骨料反应(alkali-silica reaction,ASR)膨胀性能、金属铅浸出值。结果表明:随着MG取代比例从0变化到100%,砂浆初始流动度与容重不段增加,硬化砂浆抗压强度、抗折强度和静弹性模量、干缩性能先增加后逐渐减小;MG取代比例为60%时,砂浆具有较高力学性能和较大干缩值;砂浆ASR膨胀值和硬化砂浆金属铅浸出值随MG取代比例增加而增加,但仍在安全范围内;掺加矿物掺合料的MG砂浆作为循环材料可用于干燥环境下的建筑砂浆。展开更多
The recycled cathode ray tube(CRT)funnel glass was used as replacement of magnetite sand in the concrete,and its mass replacement rates were 0,20%,40%and 60%,respectively.The flowability,apparent density and mechanica...The recycled cathode ray tube(CRT)funnel glass was used as replacement of magnetite sand in the concrete,and its mass replacement rates were 0,20%,40%and 60%,respectively.The flowability,apparent density and mechanical properties of the radiation shielding concrete were investigated,while itsγ-ray radiation shielding parameters such as linear and mass attenuation coefficients(μandμm,respectively),thickness values of half-value layer(hHVL)and tenth-value layer(hTVL)were obtained by theoretical calculation,experiment and Monte.Carlo N-Particle(MCNP)simulation code.The experimental results show that the flowability of the concrete increases significantly,whilst its apparent density,compressive strength and static elastic modulus decrease slightly.The calculated,simulated and experimentalμm,μ,hHVL and hTVL values of all concrete samples are very consistent at the sameγ-ray photon energy,and it is feasible to use MCNP code to simulateγ-ray radiation shielding parameters of materials.The calculated results show that in a wide range ofγ-ray photon energy,theμm value of the concrete with CRT funnel glass replacing magnetite sand is improved effectively,and its radiation shielding performances are the same as those of the control concrete(M.1).By comprehensively comparing the flowability,mechanical properties andγ-ray radiation shielding properties,the concrete samples with 20%.40%funnel glass as fine aggregate have good performances.展开更多
文摘为了研究不同粒径废阴极射线管玻璃(Cathode Ray Tube,简称:CRT)玻璃纱对混凝土性能的影响,采用四种最大粒径CRT废玻璃砂取代25%的河砂,同时掺入20%粉煤灰作为矿物掺合料配制成防辐射混凝土,并开展了混凝土相关性能的研究。结果表明:CRT废玻璃砂增大了混凝土的坍落度、表观密度,使得碱骨料反应膨胀率增大,混凝土抗压强度减小,混凝土屏蔽性能增强。随着最大粒径的减小,混凝土的坍落度、表观密度减小,立方体抗压强度先增大后减小,当最大粒径为2. 36 mm时,立方体抗压强度达到最大值,碱骨料反应膨胀率减小,混凝土的防辐射效果有所增强。
文摘废弃阴极射线管(cathode ray tubes,CRT)玻璃因其含有有害物质铅而导致严重环境问题,为此,使用粉煤灰、磨细矿渣作为矿物掺合料,研究了磨细阴极射线管玻璃(ground cathode ray tube glass,MG)取代0、30%、60%、100%(质量分数,下同)河砂细骨料时砂浆新拌性能、力学性能、干缩性能、碱骨料反应(alkali-silica reaction,ASR)膨胀性能、金属铅浸出值。结果表明:随着MG取代比例从0变化到100%,砂浆初始流动度与容重不段增加,硬化砂浆抗压强度、抗折强度和静弹性模量、干缩性能先增加后逐渐减小;MG取代比例为60%时,砂浆具有较高力学性能和较大干缩值;砂浆ASR膨胀值和硬化砂浆金属铅浸出值随MG取代比例增加而增加,但仍在安全范围内;掺加矿物掺合料的MG砂浆作为循环材料可用于干燥环境下的建筑砂浆。
基金Project(14JJ2083)supported by the Natural Science Foundation of Hunan Province,ChinaProject(2015JC3090)supported by the Science and Technology Department of Hunan Province,China
文摘The recycled cathode ray tube(CRT)funnel glass was used as replacement of magnetite sand in the concrete,and its mass replacement rates were 0,20%,40%and 60%,respectively.The flowability,apparent density and mechanical properties of the radiation shielding concrete were investigated,while itsγ-ray radiation shielding parameters such as linear and mass attenuation coefficients(μandμm,respectively),thickness values of half-value layer(hHVL)and tenth-value layer(hTVL)were obtained by theoretical calculation,experiment and Monte.Carlo N-Particle(MCNP)simulation code.The experimental results show that the flowability of the concrete increases significantly,whilst its apparent density,compressive strength and static elastic modulus decrease slightly.The calculated,simulated and experimentalμm,μ,hHVL and hTVL values of all concrete samples are very consistent at the sameγ-ray photon energy,and it is feasible to use MCNP code to simulateγ-ray radiation shielding parameters of materials.The calculated results show that in a wide range ofγ-ray photon energy,theμm value of the concrete with CRT funnel glass replacing magnetite sand is improved effectively,and its radiation shielding performances are the same as those of the control concrete(M.1).By comprehensively comparing the flowability,mechanical properties andγ-ray radiation shielding properties,the concrete samples with 20%.40%funnel glass as fine aggregate have good performances.
